The aim of this study was to develop a new efficient strategy that uses the Vector form Intrinsic Finite-element (VFIFE) method to conduct the static and dynamic analyses of marine pipes. Nonlinear problems, such as large displacement, small strain, and contact and collision, can be analyzed using a unified calculation process in the VFIFE method according to the fundamental theories of point value description, path element, and reverse motion. This method enables analysis without the need to integrate the stiffness matrix of the structure, because only motion equations of particles established according to Newton's second law are required. These characteristics of the VFIFE facilitate the modeling and computation efficiencies in analyzing the nonlinear dynamic problem of flexible pipe with large deflections. In this study, a three-dimensional (3-D) dynamical model based on 3-D beam element was established according to the VFIFE method. The deep-sea flexible pipe was described by a set of spatial mass particles linked by 3-D beam element. The motion and configuration of the pipe are determined by these spatial particles. Based on this model, a simulation procedure to predict the 3-D dynamical behavior of flexible pipe was developed and verified. It was found that the spatial configuration and static internal force of the mining pipe can be obtained by calculating the stationary state of pipe motion. Using this simulation procedure, an analysis was conducted on the static and dynamic behaviors of the flexible mining pipe based on a 1000-m sea trial system. The results of the analysis proved that the VFIFE method can be efficiently applied to the static and dynamic analyses of marine pipes.

这项研究的目的是开发一种新的有效策略，该策略使用矢量形式固有有限元（VFIFE）方法进行海洋管道的静态和动态分析。根据点值描述，路径元素和反向运动的基本理论，可以使用VFIFE方法中的统一计算过程来分析非线性问题，例如大位移，小应变以及接触和碰撞。该方法无需集成结构的刚度矩阵即可进行分析，因为仅需要根据牛顿第二定律建立的粒子运动方程即可。VFIFE的这些特性有助于分析大挠度挠性管的非线性动力学问题时的建模和计算效率。在这个研究中，根据VFIFE方法建立了基于3-D梁单元的三维（3-D）动力学模型。深海挠性管由一组由3-D梁单元链接的空间质量粒子描述。管道的运动和配置由这些空间粒子确定。在此模型的基础上，开发并验证了预测挠性管3-D动力学行为的仿真程序。发现通过计算管道运动的静止状态可以获得矿井管道的空间构型和静态内力。使用此模拟程序，基于1000米试航系统对挠性采矿管的静态和动态行为进行了分析。